Date: Sun, 09 Apr 2006 12:16:24 -0700 From: "Chris H." <fbsd@1command.com> To: freebsd-stable@freebsd.org Subject: Re: Pros and Cons of amd64 (versus i386). Message-ID: <20060409121624.iu6nwo6s680s8c4g@webmail.1command.com> In-Reply-To: <20060409182254.GL41551@over-yonder.net> References: <CBC0AAB4-EC80-44C8-BCCE-010DE99D4BC0@khera.org> <E1FRVcq-0004pJ-4c@dilbert.firstcallgroup.co.uk> <20060406192950.GE700@turion.vk2pj.dyndns.org> <20060408203233.K67402@woozle.rinet.ru> <20060408212421.GB720@turion.vk2pj.dyndns.org> <20060408160304.ek1xxodrkok4gw4g@webmail.1command.com> <44384EB8.8090803@samsco.org> <20060409182254.GL41551@over-yonder.net>
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Quoting "Matthew D. Fuller" <fullermd@over-yonder.net>:
> On Sat, Apr 08, 2006 at 06:00:56PM -0600 I heard the voice of
> Scott Long, and lo! it spake thus:
>>
>> Modern disks (I don't know how to define a cutoff to this term,
>> unfortunately) definitely put more bits onto the outer rim of the
>> platter than the inner rim.
>
> Pretty much any disk you'd currently find, I'd say.
>
> diskinfo -t won't run through on my 4 or 2 gigs ("disk too small for
> test" :), but on my 9 gigger:
>
> Transfer rates:
> outside: 102400 kbytes in 5.215159 sec = 19635 kbytes/sec
> middle: 102400 kbytes in 6.268067 sec = 16337 kbytes/sec
> inside: 102400 kbytes in 8.237962 sec = 12430 kbytes/sec
>
> da4 at ahc2 bus 0 target 5 lun 0
> da4: <IBM DNES-309170W SAH0> Fixed Direct Access SCSI-3 device
> da4: 40.000MB/s transfers (20.000MHz, offset 31, 16bit), Tagged
> Queueing Enabled
> da4: 8748MB (17916240 512 byte sectors: 255H 63S/T 1115C)
Well, as long as we're at it:
512 # sectorsize
15728640000 # mediasize in bytes (15G)
30720000 # mediasize in sectors
1912 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 4.058565 sec = 16.234 msec
Half stroke: 250 iter in 3.249077 sec = 12.996 msec
Quarter stroke: 500 iter in 5.544275 sec = 11.089 msec
Short forward: 400 iter in 2.595878 sec = 6.490 msec
Short backward: 400 iter in 2.547004 sec = 6.368 msec
Seq outer: 2048 iter in 0.486885 sec = 0.238 msec
Seq inner: 2048 iter in 0.500109 sec = 0.244 msec
Transfer rates:
outside: 102400 kbytes in 5.517532 sec = 18559 kbytes/sec
middle: 102400 kbytes in 6.233613 sec = 16427 kbytes/sec
inside: 102400 kbytes in 8.044342 sec = 12729 kbytes/sec
at ahc0 bus 0 target 1 lun 0
<WDIGTL WDE18300 ULTRA2 1.30> Fixed Direct Access SCSI-2 device Serial
Number WS7060096840
40.000MB/s transfers (20.000MHz, offset 31, 16bit)
Interesting to note (to me anyway) is my SCSI reports fastest on the outside
whereas my (earlier reported) ATA reports faster in the center (middle).
--Chris H.
>
>
> --
> Matthew Fuller (MF4839) | fullermd@over-yonder.net
> Systems/Network Administrator | http://www.over-yonder.net/~fullermd/
> On the Internet, nobody can hear you scream.
> _______________________________________________
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>
--
Linux:
As OS for users who think their using UNIX.
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FreeBSD 5.4-RELEASE-p12 (SMP - 900x2) Tue Mar 7 19:37:23 PST 2006
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